JavaScript 开发中规范性的一点感想

//待需要时另存为一个js

function isNull(obj)
{
if (!obj || obj.length==0 || obj=="")
{
parent.MyAlert("标注名不能为空!",alertImg);
return false;
}
else
{
return true;
}
}

// 验证是否为整数
function isNumber(oNum)
{
if(!oNum) return false;

try{
if(parseInt(oNum)!=oNum) {
parent.MyAlert("查询距离请填写正整数!",alertImg);
return false;
}
}
catch(ex)
{
parent.MyAlert("查询距离请填写正整数!",alertImg);
return false;
}

return true;
}

// 验证是否为中文
function isChinese(oCn)
{
if (!oCn || oCn.length==0) return false;

try{
var reg = /^[\u4e00-\u9fa5]+$/i; //含中文

if ( reg.test(oCn) )
{
return true;
}
else{
parent.MyAlert("关键字请填写中文!",alertImg);
return false;
}
}
catch(ex)
{
parent.MyAlert("关键字请填写中文!",alertImg);
return false;
}
}

// 验证是否为中文或字母
function isEnCh(oStr)
{
if (!oStr || oStr.length==0) return false;

try{
var reg = /^[a-zA-Z\u4E00-\u9FA5]/g; //含中文或拼音

if ( reg.test(oStr) )
{
return true;
}
else{
parent.MyAlert("地名请填写中文或拼音!",alertImg);
return false;
}
}
catch(ex)
{
parent.MyAlert("地名请填写中文或拼音!",alertImg);
return false;
}
}

// 结果保留2位小数
function roundAmount(n){
var s = "" + Math.round(n * 100) / 100;
var i = s.indexOf('.')
if (i < 0) return s + ".00";

var t = s.substring(0, i + 1) + s.substring(i + 1, i + 3);
if (i + 2 == s.length) t += "0";

return t;
}

var page_res = {
    "meter": "米",
    "kilometer": "千米（公里）",
    "mile": "英里",
    "yard": "码",
    "degree": "度",
    "millimeter": "毫米",
    "saveMap": "保存地图",
    "printMap": "打印地图",
    "queryResult": "查询结果",
    "queryResultNull": "查询结果为空",
    "experssionCanNotNull": "查询表达式不能为空",
    "networkInfo": "路径信息",
    "arcInfo": "弧段信息",
    "addEntitySuccess": "添加地物成功! ",
    "addEntityFail": "添加地物失败!",
    "updateEntitySuccess": "更新地物成功!",
    "updateEntityFail": "更新地物失败!",
    "updatePropertySuccess": "更新属性成功!",
    "updatePropertyFail": "更新属性失败!",
    "deleteEntitySuccess": "删除地物成功!",
    "deleteEntityFail": "删除地物失败!",
    "closestFacilityFail": "最近设施分析失败，请重新选择",
    "fieldCanNotNull": "字段数不能为空",
    "fieldMustInteger": "字段数必须为整数",
    "fieldMustMoreThanZero": "字段数必须大于0",
    "numberCanNotNull": "数值不能为空"
}

var xmlhttpObj=false;
function XHR(CallBack)
{
this.callback=CallBack;
}
XHR.createXMLHttp = function ()
{
if(window.ActiveXObject) //IE浏览器
{
try
{
xmlhttpObj = new ActiveXObject("Microsoft.XMLHTTP");//IE4.0
}
catch (e)
{
try
{
xmlhttpObj = new ActiveXObject("Msxml2.XMLHTTP");//IE5.0以上
}
catch (e2)
{
xmlhttpObj=false;
}
}
}
else if(window.XMLHttpRequest&&!xmlhttpObj) //开放浏览器
{
xmlhttpObj = new XMLHttpRequest();
}
}
XHR.prototype.Onstar = function (method,Url,bFlag,param)
{
if(this.callback!=null)
{
XHR.createXMLHttp();
xmlhttpObj.onreadystatechange=this.callback;
xmlhttpObj.open(method,Url,bFlag);
xmlhttpObj.setRequestHeader("Content-Type","application/x-www-form-urlencoded;");
xmlhttpObj.send(param);
}
else
{
alert("没有客户端处理函数!")
}
}